Dr Hilary Jones has told Good Morning Britain viewers which Strep A signs to look out for in their children.
His warning, issued on Tuesday morning on the ITV show, came after the death of eight children in the UK from Strep A. The health expert was discussing the outbreak with hosts Robert Rinder and Susanna Reid and said: "Invasive Strep A is a rare disease.
"While it's killed eight children it's very very unusual to see such serious illnesses - we're talking of a rate of 2.3 in 100,000 children. However, it doesn't make it any easier for a parent who is worrying about their children.